EP0320688B1 - Reflektionssende- und Empfangseinrichtung für ein bidirektionales LWL-Kommunikationssystem - Google Patents

Reflektionssende- und Empfangseinrichtung für ein bidirektionales LWL-Kommunikationssystem Download PDF

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Publication number
EP0320688B1
EP0320688B1 EP88119834A EP88119834A EP0320688B1 EP 0320688 B1 EP0320688 B1 EP 0320688B1 EP 88119834 A EP88119834 A EP 88119834A EP 88119834 A EP88119834 A EP 88119834A EP 0320688 B1 EP0320688 B1 EP 0320688B1
Authority
EP
European Patent Office
Prior art keywords
optical
waveguide
optical waveguide
communication system
reflection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88119834A
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German (de)
English (en)
French (fr)
Other versions
EP0320688A1 (de
Inventor
Stefan Dr.Rer.Nat. Dipl-Phys. Kindt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT88119834T priority Critical patent/ATE85482T1/de
Publication of EP0320688A1 publication Critical patent/EP0320688A1/de
Application granted granted Critical
Publication of EP0320688B1 publication Critical patent/EP0320688B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2587—Arrangements specific to fibre transmission using a single light source for multiple stations
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/225—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference in an optical waveguide structure

Definitions

  • An optical (intensity) modulator can be designed with a controllable optical directional coupler (telcom report 10 (1987) 2, 90 ... 98, pictures 8 and 9; WO-A-87/06084, FIG. 3).
  • Such an optical directional coupler has two optical strip waveguides of the same type - these are narrow thin strips produced by diffusion (e.g.
  • the object of the invention is now to provide a way for a particularly expedient embodiment of a reflection transmitting and receiving device for a bidirectional optical fiber communication system with (one) light source (s) only at one end of the optical fiber link.
  • a reflection transmitter has already been specified for a bidirectional optical fiber communication system with (a) light source (s), preferably formed by (a) laser, only one end of the optical waveguide, which has one input / output to the optical waveguide Connected halved controllable optical directional coupler is formed, the two strip waveguides are terminated with a semitransparent mirror and the control electrodes are acted upon by the transmission signal, wherein behind the semitransparent mirror one of the two strip waveguides can be provided with the received light signal by an optoelectric converter (EP-A -0 301 388, published on February 1, 1989).
  • an optoelectric converter EP-A -0 301 388
  • the invention shows another way to a particularly expedient design of a reflection transmitting and receiving device.
  • the invention relates to a reflection transmitting and receiving device for a bidirectional fiber optic communication system with a light source (s), preferably formed by (a) laser, only at one end of the optical waveguide; this reflection transmitting and receiving device is characterized according to the invention in that behind a second semitransparent mirror facing away from the optical waveguide, an electrically controllable, integrated-optical Fabry-Perot resonator is connected to the input / output on the optical waveguide, which is formed by its first semitransparent mirror and the control electrodes are acted upon by the transmission signal, an optoelectric converter is provided via the strip waveguide with the received light signal.
  • a light source preferably formed by (a) laser
  • Fabry-Perot resonators or interferometers are arrangements with two mutually parallel reflectors (mirrors), between which light is reflected back and forth like resonance, at least one of the two Mirror is partially transparent, so that light can pass through it - to use length measurements by moving at least one of the two reflectors and linking the reflector distance with the length or length change to be measured, so that the light transmission then periodically depends on the reflector distance (DE -A1-30 44 183).
  • the integrated optical module consists only of a linear waveguide section and two polished and coated end faces - has the further advantage that there are no great demands on the photolithography for its production that the space and material requirements are low and that, in terms of production technology, one can fall back on existing integrated optical phase modulators (see telcom report loc. cit., Fig. 6), in which case the anti-reflective coating on the end faces must be replaced by a reflective layer; a very inexpensive manufacture of the reflection transmitter according to the invention is therefore foreseeable.
  • FIG. 1 shows schematically in FIG. 1 an embodiment of a reflection transmitting and receiving device according to the invention with an electrically controllable, integrated-optical Fabry-Perot resonator FPR, which is connected at its one input / output AI to an optical waveguide; this fiber optic fiber may be part of a bidirectional fiber optic communication system and as is also indicated in FIG. 1, have at one end a transmitter with an electro-optical converter, for example a laser diode, and a receiver with an opto-electrical converter, for example a pin diode, which is connected to the optical waveguide via a beam splitter T. are.
  • an electro-optical converter for example a laser diode
  • opto-electrical converter for example a pin diode
  • the bidirectional fiber-optic communication system does not have its own light source as a transmitter, but rather a reflection transmitter formed by the integrated optical Fabry-Perot resonator FPR, which passes through one end of the bidirectional fiber-optic communication system to said one can be modulated to be transmitted transmission signal.
  • the electrically controllable integrated-optical Fabry-Perot resonator FPR also separately sketched in FIG. 2, has a linear optical monomode strip waveguide SL diffused into a substrate S, for example lithium niobate; the end faces of the LiNbO3 crystal are brought perpendicular to the waveguide by polishing to optical quality and provided with a partially transparent dielectric mirroring SI, SII.
  • the optical waveguide SL and the mirrored end faces SI, SII together form the optical resonator.
  • the partially transparent mirroring SI forms an input / output AI, to which the integrated optical resonator FPR is connected to the optical fiber LWL; behind the other partially transparent mirror SII is the optoelectric converter o / e of a receiver, for example a pin diode, which is not shown in further details.
  • Control electrodes E, O for example made of aluminum, are evaporated parallel to the linear optical waveguide SL; by applying an electrical voltage to these electrodes, it is possible to change the refractive index of the LiNbO3 crystal and thus the optical path length between the two mirrored end faces SI, SII of the resonator FPR by means of the electro-optical effect.
  • These electrodes E, O are acted upon by a transmission signal to be transmitted via the optical waveguide, for example a 140 Mbit / s signal.
  • optical path length between the mirrors SI, SII corresponds exactly to an odd multiple of the quarter wavelength, there is a mutual extinction of light waves in the forward direction and a constructive interference for the direction back to the optical fiber LWL, so that a maximum of light reaches the optical fiber LWL .
  • the reflection transmitter sketched in the drawing then works as follows: A light signal (eg 680 Mbit / s) transmitted from the opposite side of the FO communication system via the single-mode optical waveguide LWL, preferably with a low degree of modulation (e.g. 10%), occurs at the input / Output AI into the strip waveguide SL at an intensity corresponding to the transmittance of the end face SI, and the portion of the received light signal carried in the strip waveguide SL corresponding to the transmittance of the partially transparent mirror SII, for example, of approximately 40% passes through the semitransparent mirror SII and arrives at the optoelectric converter o / e located behind it.
  • a light signal eg 680 Mbit / s
  • LWL single-mode optical waveguide LWL
  • the interference between the transmission signal voltage applied to the control electrodes E, O between the light wave trains transmitted by the mirror SI acts as an intensity modulation (preferably with a high degree of modulation (e.g. 100%)) of the light, which is transmitted via the input / output AS of Strip waveguide SL comes back into the optical fiber LWL, where it is then transmitted in the reverse direction to the other end of the fiber optic communication system.
  • the light can be transmitted back in maximum intensity via the optical fiber in one limit case (with constructive interference), and in the other limit case (with destructive interference) this light can be completely extinguished.
  • the instantaneous value of the transmission signal lies between the limit values, one will move between the limit cases described.
  • a special section of the LiNbO3 crystal can be used for a LiNbO3 substrate in which the strip waveguides SLI, SLII are formed by diffusion of titanium, for which the electro-optical Coefficients for TE and TM modes are the same.
  • a preferred embodiment of an integrated optical reflection transmit / receive module according to the invention has the following features: Overall length approx. 15 mm Total loss about 15% per facet Crystal section along the crystallographic X axis Waveguide along the crystallographic Y axis Reflectance of the mirroring approx. 40% Transmitted signal voltage U St ⁇ 3 V
  • the operating point of the reflection transmitter module can be set by applying a DC voltage to the transmission signal voltage. Since the amplitude modulation of the light reflected by the transmission signal voltage to the optical waveguide is also reflected in the optical signal transmitted to the opto-electrical converter o / e, part of the signal received by the subscriber can also be used to control the FPR module via a control circuit at the optimum operating point to stabilize. If the FPR module is exposed to strong temperature fluctuations, a combined thermal and electrical control can stabilize the operating point of the module. Here can the electronic control compensates for fast disturbances and the thermal control (using a Peltier element) long-term drifts.
  • the data rates for the two transmission directions should differ significantly from one another, so that existing crosstalk between the forward and return channels can be eliminated by electronic filtering.
  • This requirement is given, for example, for a subscriber connection to a broadband ISDN (with distribution services):
  • a laser transmitter in the office sends a 680 Mbaud signal with a degree of modulation of 10% via a single-mode optical fiber through the Fabry-Perot resonator FPR through to the optical receiving element o / e of the subscriber.
  • the Fabry-Perot resonator FPR is switched back and forth between the reflecting and the transmitting state, so that the light reflected back to the exchange carries a data rate of 140 Mbaud with a modulation degree of approx the light signal received by the opposite side of the optical fiber communication system, preferably of a low degree of modulation, is superimposed as a slight high-frequency interference.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Optical Integrated Circuits (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
EP88119834A 1987-12-15 1988-11-28 Reflektionssende- und Empfangseinrichtung für ein bidirektionales LWL-Kommunikationssystem Expired - Lifetime EP0320688B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88119834T ATE85482T1 (de) 1987-12-15 1988-11-28 Reflektionssende- und empfangseinrichtung fuer ein bidirektionales lwl-kommunikationssystem.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3742504 1987-12-15
DE3742504 1987-12-15

Publications (2)

Publication Number Publication Date
EP0320688A1 EP0320688A1 (de) 1989-06-21
EP0320688B1 true EP0320688B1 (de) 1993-02-03

Family

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Application Number Title Priority Date Filing Date
EP88119834A Expired - Lifetime EP0320688B1 (de) 1987-12-15 1988-11-28 Reflektionssende- und Empfangseinrichtung für ein bidirektionales LWL-Kommunikationssystem

Country Status (9)

Country Link
US (1) US4955086A (ru)
EP (1) EP0320688B1 (ru)
JP (1) JP2787812B2 (ru)
AT (1) ATE85482T1 (ru)
CA (1) CA1292283C (ru)
DE (1) DE3878194D1 (ru)
HU (1) HU200048B (ru)
LU (1) LU87164A1 (ru)
RU (1) RU2043002C1 (ru)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682239B1 (fr) * 1991-10-04 1994-11-04 Cit Alcatel Systeme de transmission bidirectionnelle, notamment par fibre optique, avec une porteuse unique pour les deux sens de transmission.
US5359450A (en) * 1992-06-25 1994-10-25 Synchronous Communications, Inc. Optical transmission system
US5373389A (en) * 1992-10-27 1994-12-13 General Instrument Corporation Method for linearizing an unbalanced Mach Zehnder optical frequency discriminator
US5657148A (en) * 1996-05-07 1997-08-12 Lucent Technologies Inc. Apparatus and method for a single-port modulator having amplification
JP3101713B2 (ja) * 1999-02-22 2000-10-23 東北大学長 電界放射陰極およびそれを用いる電磁波発生装置
DE10014644A1 (de) 2000-03-24 2001-10-11 Infineon Technologies Ag Optisches Modul zur Wellenlängen-Referenzmessung in WDM-Systemen
DE10037151C2 (de) * 2000-07-31 2002-11-21 Am3 Automotive Multimedia Ag Netzknoten in einem Ringbus und Verfahren zu dessen Betrieb
FR2825805B1 (fr) * 2001-06-07 2006-02-24 France Telecom Dispositif de raccordement hybride entre fibres optiques et lignes transportant des signaux electriques, et reseaux incorportant ce dispositif
GB0521248D0 (en) * 2005-10-19 2005-11-30 Qinetiq Ltd Optical communications
US8548326B2 (en) 2011-03-23 2013-10-01 Chrysler Group Llc Optical communication system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2708606A1 (de) * 1977-02-28 1978-08-31 Siemens Ag Kommunikationssystem
US4195269A (en) * 1978-04-19 1980-03-25 Rca Corporation Two-way single fiber optical communication system
US4198115A (en) * 1978-08-16 1980-04-15 Bell Telephone Laboratories, Incorporated Fabry-Perot resonator using a birefringent crystal
JPS56111417A (en) * 1980-02-06 1981-09-03 Yokogawa Hokushin Electric Corp Transducer
DE3044183A1 (de) * 1980-11-24 1982-06-24 Reinhard Dipl.-Phys. Dr. 7250 Leonberg Ulrich Verfahren zur optischen messung von laengen und laengenaenderungen und anordnung zur durchfuehrung des verfahrens
US4436365A (en) * 1981-10-21 1984-03-13 Bell Telephone Laboratories, Incorporated Data link using integrated optics devices
DD240475B5 (de) * 1985-08-19 1996-05-15 Alcatel Sel Rft Gmbh Anordnung zum Rueckuebertragen von Signalen in Lichtwellenleiter-Nachrichtenuebertragungsanlagen
US4775971A (en) * 1986-03-27 1988-10-04 American Telephone And Telegraph Company, At&T Bell Laboratories Optical communication system

Also Published As

Publication number Publication date
HU200048B (en) 1990-03-28
EP0320688A1 (de) 1989-06-21
HUT48782A (en) 1989-06-28
LU87164A1 (de) 1988-08-23
JPH022730A (ja) 1990-01-08
JP2787812B2 (ja) 1998-08-20
CA1292283C (en) 1991-11-19
RU2043002C1 (ru) 1995-08-27
DE3878194D1 (de) 1993-03-18
US4955086A (en) 1990-09-04
ATE85482T1 (de) 1993-02-15

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